Pentax ASAHI SPOTMATIC 23102 Service Manual page 41

DEFECTS:
3. The resistance values of CdS cell
CAUSES:
are inconststent.
How to check it:
Test whether or not the needle
functioning of the meter is correct
with the Light Value Correction
Unit.
Refer to Service Memorandum
dated 5 October 1964 under the
sublect "Adapter for tight Value
Correction Unit for Checking
Spotmatic."
23102
SERVICING:
3. Replace CdS cells.
NOTE:
CdS cells are divided into
three types and are wrapped
and supplied in envelope
marked red, blue or white,
according to the Sensitivity.
The variable resistor (010008)
is also divided into three types
according to its characteristics.
Thus, CdS cells and variable
resistor marked with the same
colour are combined and
assembled as a unit. Conse-
quently, when replacing CdS
cells, use the CdS cells in
envelope marked with the
same colour as that painted on
the side of the variable resistor
(10008).
Also remember that the
two
cells installed have to be replaced at
the same time, as it is extremely
difficult to determine which one of
the CdS cells is defective. When
installing CdS cells on the prism
seat, see to it that the shorter lead
wire come to the viewfinder sides,
as illustrated.
At present, lead wire of CdS cells is
covered wit'h a green coloured
tube. However,CdS cells ore
expected to be supplied in the
future in tubes with red, blue or
white colour according to the
sensitivity.
CdS
Page 40